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/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef WEBRTC_BASE_BYTEORDER_H_
#define WEBRTC_BASE_BYTEORDER_H_
#if defined(WEBRTC_POSIX) && !defined(__native_client__)
#include <arpa/inet.h>
#endif
#if defined(WEBRTC_WIN)
#include <stdlib.h>
#endif
#include "webrtc/base/basictypes.h"
namespace rtc {
// Reading and writing of little and big-endian numbers from memory
// TODO: Optimized versions, with direct read/writes of
// integers in host-endian format, when the platform supports it.
inline void Set8(void* memory, size_t offset, uint8_t v) {
static_cast<uint8_t*>(memory)[offset] = v;
}
inline uint8_t Get8(const void* memory, size_t offset) {
return static_cast<const uint8_t*>(memory)[offset];
}
inline void SetBE16(void* memory, uint16_t v) {
Set8(memory, 0, static_cast<uint8_t>(v >> 8));
Set8(memory, 1, static_cast<uint8_t>(v >> 0));
}
inline void SetBE32(void* memory, uint32_t v) {
Set8(memory, 0, static_cast<uint8_t>(v >> 24));
Set8(memory, 1, static_cast<uint8_t>(v >> 16));
Set8(memory, 2, static_cast<uint8_t>(v >> 8));
Set8(memory, 3, static_cast<uint8_t>(v >> 0));
}
inline void SetBE64(void* memory, uint64_t v) {
Set8(memory, 0, static_cast<uint8_t>(v >> 56));
Set8(memory, 1, static_cast<uint8_t>(v >> 48));
Set8(memory, 2, static_cast<uint8_t>(v >> 40));
Set8(memory, 3, static_cast<uint8_t>(v >> 32));
Set8(memory, 4, static_cast<uint8_t>(v >> 24));
Set8(memory, 5, static_cast<uint8_t>(v >> 16));
Set8(memory, 6, static_cast<uint8_t>(v >> 8));
Set8(memory, 7, static_cast<uint8_t>(v >> 0));
}
inline uint16_t GetBE16(const void* memory) {
return static_cast<uint16_t>((Get8(memory, 0) << 8) | (Get8(memory, 1) << 0));
}
inline uint32_t GetBE32(const void* memory) {
return (static_cast<uint32_t>(Get8(memory, 0)) << 24) |
(static_cast<uint32_t>(Get8(memory, 1)) << 16) |
(static_cast<uint32_t>(Get8(memory, 2)) << 8) |
(static_cast<uint32_t>(Get8(memory, 3)) << 0);
}
inline uint64_t GetBE64(const void* memory) {
return (static_cast<uint64_t>(Get8(memory, 0)) << 56) |
(static_cast<uint64_t>(Get8(memory, 1)) << 48) |
(static_cast<uint64_t>(Get8(memory, 2)) << 40) |
(static_cast<uint64_t>(Get8(memory, 3)) << 32) |
(static_cast<uint64_t>(Get8(memory, 4)) << 24) |
(static_cast<uint64_t>(Get8(memory, 5)) << 16) |
(static_cast<uint64_t>(Get8(memory, 6)) << 8) |
(static_cast<uint64_t>(Get8(memory, 7)) << 0);
}
inline void SetLE16(void* memory, uint16_t v) {
Set8(memory, 0, static_cast<uint8_t>(v >> 0));
Set8(memory, 1, static_cast<uint8_t>(v >> 8));
}
inline void SetLE32(void* memory, uint32_t v) {
Set8(memory, 0, static_cast<uint8_t>(v >> 0));
Set8(memory, 1, static_cast<uint8_t>(v >> 8));
Set8(memory, 2, static_cast<uint8_t>(v >> 16));
Set8(memory, 3, static_cast<uint8_t>(v >> 24));
}
inline void SetLE64(void* memory, uint64_t v) {
Set8(memory, 0, static_cast<uint8_t>(v >> 0));
Set8(memory, 1, static_cast<uint8_t>(v >> 8));
Set8(memory, 2, static_cast<uint8_t>(v >> 16));
Set8(memory, 3, static_cast<uint8_t>(v >> 24));
Set8(memory, 4, static_cast<uint8_t>(v >> 32));
Set8(memory, 5, static_cast<uint8_t>(v >> 40));
Set8(memory, 6, static_cast<uint8_t>(v >> 48));
Set8(memory, 7, static_cast<uint8_t>(v >> 56));
}
inline uint16_t GetLE16(const void* memory) {
return static_cast<uint16_t>((Get8(memory, 0) << 0) | (Get8(memory, 1) << 8));
}
inline uint32_t GetLE32(const void* memory) {
return (static_cast<uint32_t>(Get8(memory, 0)) << 0) |
(static_cast<uint32_t>(Get8(memory, 1)) << 8) |
(static_cast<uint32_t>(Get8(memory, 2)) << 16) |
(static_cast<uint32_t>(Get8(memory, 3)) << 24);
}
inline uint64_t GetLE64(const void* memory) {
return (static_cast<uint64_t>(Get8(memory, 0)) << 0) |
(static_cast<uint64_t>(Get8(memory, 1)) << 8) |
(static_cast<uint64_t>(Get8(memory, 2)) << 16) |
(static_cast<uint64_t>(Get8(memory, 3)) << 24) |
(static_cast<uint64_t>(Get8(memory, 4)) << 32) |
(static_cast<uint64_t>(Get8(memory, 5)) << 40) |
(static_cast<uint64_t>(Get8(memory, 6)) << 48) |
(static_cast<uint64_t>(Get8(memory, 7)) << 56);
}
// Check if the current host is big endian.
inline bool IsHostBigEndian() {
static const int number = 1;
return 0 == *reinterpret_cast<const char*>(&number);
}
inline uint16_t HostToNetwork16(uint16_t n) {
uint16_t result;
SetBE16(&result, n);
return result;
}
inline uint32_t HostToNetwork32(uint32_t n) {
uint32_t result;
SetBE32(&result, n);
return result;
}
inline uint64_t HostToNetwork64(uint64_t n) {
uint64_t result;
SetBE64(&result, n);
return result;
}
inline uint16_t NetworkToHost16(uint16_t n) {
return GetBE16(&n);
}
inline uint32_t NetworkToHost32(uint32_t n) {
return GetBE32(&n);
}
inline uint64_t NetworkToHost64(uint64_t n) {
return GetBE64(&n);
}
} // namespace rtc
#endif // WEBRTC_BASE_BYTEORDER_H_
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